Telephone apparatus.



I D. H. WILSON.

TELEPHONE APPARATUS APPLICATION FILED AUG. 7, 1903.

1,015,255. Patented Jam 16, 1912.4

I I I 5 g m a, i

To all whom it may concern:

U lh l lllhll j crowns llhh'll llihl' @hlhlfllldr DAVIDIL WILSON, D11 CHEEJAGG, ILLINOIS, ASSIGNOR, BY MESNE ASSlIGNlVIENTS, TO

STILlNELL-WILSON TELEPHONE GOMPAN'FE, (913" NEW YORK, N. "EL, 1%. CORPORA TION OF ARIZONA TERRITORY.

' TELEPHONE APPARATUS.

]l,fi5,255 Specification of Letters Patent Fer-tented Jan. 16,1912.

Application filed August'i, 1903. Serial No. 168,571.

l 3e it known that L DAVID I citizen of the United States, residing at Ch1- cage, in the county of Cook and State of Illinois, have invented a certs-in new and "useful Improvement 111 Telephone Apparelhrs, of Whichthe following is aspecification. -MYY1IIVEHUOII relates to telephone devices and has for its object toprovide's new and improved device of this description.

My invention is illustrated 111. the accompanying drawings, wherein,

Figure 1 -1s a. diagrammatic View of a telephone system embodying my invention;

Fig; 2 is a view showing series of sources of electric supply in the lusin 1111s..

Like lettersreier to like pal-ts throughout the several figures.- v v Inthe drawing I have illustrated dia-f grammatically s construction embodying my invention. In order to simplify the drawing I-hove omitteddetails cs to the construction and arrangement of the signal 'clrcuit and the like, and II'LWlll be understood that any suitable arrangementof such circuits may heprovided. I have also only illustrated a circuit containing two. instru ments and have thus avoided the confusion -which would result from attempting to showaconiplete system.

Referring now to the drawing, instrunients Aend B are connected by the lines 'A ..will be short eil-suited.

and may be any desired distance. apart. Re. lerring to the instrument A it will be noted that there is provided a transmitter A and a receiver A located in separate circuits. Located in the transmitter circuit a coil A and a battery or source of electric supply A In the receiver or line circuit is a divided coil A? JQlWQQll'WlllCll is located the receiver and there is also source of ele ctrlc supply A which in this instance is 1llus--.

ihe

rmred as s dynamo electric mochincv coils Ar and A are located on the core A.

I prefer to arrange the two circuits so that when the device is not in use the transmitter circuit will be broken and the coils AF and This may be done by the receiver hook in the ordinssg' Way. It Will be noted that in this construell'ion there are tivo circuiis, one containing; the receiver and the other the transmitter end that each ofthese circuits has a separate source of electric supply. l have found 7' th-rit bythis arrangement. a long distance H; WVILSOX a circuit are required only'to impress upon telephone is produced by means of which I am able to get, results not possible with any of the devices now on the market.

When the device is in operation there is s current in the receiver circuit, that is, the line circuit. When a' person talks into the transmitter thecurreutfin the transmitter circuit is varied andthe effect of this variation is transmitted tolthe coil A? and, asit were, impresses itself uponthe already existing current in said coil,21nd the said c ur-' rent then takes on the character, es it-were, of a talking current.' The great advente e of-this system foulong distance talking W1 1' thus he 'eadily uppreciated for itwill be seen that the talking current an d thedistunce lt-may be transmittedis not dependent upon the secondary-current developed by the .variations in the transmitter circuitbutdepends upon. an independent source of elec-a iricity' in the said main line circuitfor re;

ceiver circuit and this main line current can thus be transmitted lei 1g distances hyus'in'g the proper means or bypro'viding a number of SOULCGS Of electric supply located at. intervals along the line.v In other words,- the. liransmitting'capacity of this-device depends upon a source of electric supply in thefline circuit ahd the variations in the transmitter this previously produced current the cheracteristics of a talkingc'urrent and this isthen reproduced into speech st the other .end' of the line by means of the receiver there located.

In :Fig. 2 I lmvejillustrated a line, containing 11- series Of'SOHIQCS or electric sup ply A It is course evident that the coils and various parts'niuy be arranged T rany suitable nmi'luen, itonly being necessary that the arrangement of the coils be such that the characteristics of the varying current is the transmitter circuithe'cou'nifiunicated to the indey iendently produced current in the receiver or line circuit.

By nieslns of my present invention, the

'eyil eifects of induction. are practically obviated and the voice 1S trsnsnnttedfroni one instriunent to the other over long distances and reproduced so as to beplein and clear 1G5 and free from the distracting effects due to induction, so prevalent in connection with the present apparatus.

I have illustratedin' Fig. 1 a-simple construction forv cutting out the coils and open-- ing the transmitter circuit when the device is not in operation. In this construction the transmitter 'circuitis provided with two contacts D and D which, when together complete the circuit and when sepa-' "rated open the circuit. Associated with the receiver or main circuit is a conductor Econnected to a contact E and a conductor E connected to acontact The recoils.

ceiver hook F is provided with a projection which extends between the contacts- D and E and when the receiver 'is on the hook the contacts E and E are together, thus completing a short circuitaround the In this condition the contacts D and D are 1 separated. When the receiver is removed from the hook, the associated spring moves the parts' so that the contacts D and D are brought together and the contacts E and E. -are separated.

I have illustrated in the. drawings 'a simplelarrangement for carrying out my invention but it is of course evident that various arrangements may be utilized, the

essential thing being that a current in the being reinforced by, the talking current in" the circuit associated therewith so that the composite current, as it were, may be converted into speech at the receiving end or station.

I claim:

1. A telephone apparatus, comprising a" transmitter circuit and a receiver circuit, a coil in one of said circuits wrapped about a suitable core, a divlded-coil 1n the other c111- Lowest cuit having a part located on each side of the first mentioned coil 9. receiver in circuit with the divided coil and a .source of electric supply in both of said circuits 2. A telephone apparatus, comprising a transmitter'circuit and a receiver circuit separate from each other, a coil in the transmitter circuit, a divided coil. in the receiver cir-- cuit the two parts of which are locatedat one endof said circuit, a receiver connected between the sections of said divided coil and incircuit therewith and a source of electric supply in both of said circuits and means for short-circuiting the two parts of said divided coil.

3. A telephone apparatus comprising a main line contain ng a source of, electrlc supply, a recelver connected 111 said main line at each end thereof, a local circuit at each end of said main line comprising a source of electric supply and a transmitter, a part of each local circuit being wound around the middle portion of the core at the end of the main line with which it is associated, a portion of the main line being wound around said core on' both sides of the winding of the local circuit,the receiver being connected in the main line circuit between the two sections of. said windings.

4. A. telephone apparatus comprising. two circuits one, containing a transmitter and the other a receiver, the circuit containing the: receiver being the-main 'line circuit, a 'coil. located in each of said circuits and in proximity. to each other, the coil in the .main line circuit divided into two sections,

one located on 'ea'ch'side the coil in the other circuit, an independent source of electric supply connected with each ofsaid circuits, and means for short-circuiting the coil in the main line circuit and opening the circuit containing the transmitter under predetermined conditions.

DAVID H. WILSON.

Witnesses:

HOMER L. KRAFT, EDWARD T. WRAY. 

